Reset all elements within some selector scope. To reset the selector itself,
mixin the appropriate reset mixin for that element type as well. This could be
useful if you want to style a part of your page in a dramatically different way.

Unrecognized elements are displayed inline.
This reset provides a basic reset for html5 elements
so they are rendered correctly in browsers that don't recognize them
and reset in browsers that have default styles for them.

Resets the display of inline and block elements to their default display
according to their tag type. Elements that have a default display that varies across
versions of html or browser are not handled here, but this covers the 90% use case.
Usage Example:

// Turn off the display for both of these classes
.unregistered-only, .registered-only
display: none
// Now turn only one of them back on depending on some other context.
body.registered
+reset-display(".registered-only")
body.unregistered
+reset-display(".unregistered-only")